The MotoBatt MB9U is a powerful AGM upgrade for several conventional wet batteries. In fact it replaces 21 OEM batteries by using patented QuadFlex terminals and height adjusting spacers. The advanced AGM sealed technology provides up to 55% more capacity compared to the old conventional style and comes with an industry leading 2 year replacement warranty. The three most popular batteries customers are upgrading are the YB9-B, 12N9-4B-1, and YB7-A. See all 21 OEM batteries the MB9U replaces in the chart below: